Android: How to implement "Facebook easy login"?

It's hard to explain in words what I'm talking about.

When you open an app on your phone, sometimes it requires you to give a username/email and password credentials. Some applications have an option to "Login with Facebook" and quickly allows the user to login to facebook. By doing this, it gives you a new account by using your facebook information (I guess?).

I know you can do this with my websites too.

My question is what is this called? does facebook devs have a specific name for this? If so, how can I implement it through android, and even through web development?


UPDATE: For example: When you log into this stackoverflow site. You are able to click on the "login with Facebook" and quickly login without have to fill in information. I know it's the same way with the stackoverflow android app.


Facebook uses OAuth 2.0.

Related: OAuth Facebook API Tutorial

I think you are looking for the word "OpenID". Facebook logins are OpenIDs. Allowing users to use the same credentials for different webpages

What you are looking for is called Facebook Single Sign-On. The facebook developer docs should be enough to get you started.

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